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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.tempnam" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>tempnam</refname>
<refpurpose>Create file with unique file name</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>string</type><type>false</type></type><methodname>tempnam</methodname>
<methodparam><type>string</type><parameter>directory</parameter></methodparam>
<methodparam><type>string</type><parameter>prefix</parameter></methodparam>
</methodsynopsis>
<para>
Creates a file with a unique filename, with access permission set to 0600, in the specified directory.
If the directory does not exist or is not writable, <function>tempnam</function> may
generate a file in the system's temporary directory, and return
the full path to that file, including its name.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>directory</parameter></term>
<listitem>
<para>
The directory where the temporary filename will be created.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>prefix</parameter></term>
<listitem>
<para>
The prefix of the generated temporary filename.
</para>
<note>
<simpara>
Only the first 63 characters of the prefix are used, the rest are ignored.
Windows uses only the first three characters of the prefix.
</simpara>
</note>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the new temporary filename (with path), or &false; on
failure.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>7.1.0</entry>
<entry>
<function>tempnam</function> now emits a notice when falling back to the
temp directory of the system.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>tempnam</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$tmpfname = tempnam("/tmp", "FOO");
$handle = fopen($tmpfname, "w");
fwrite($handle, "writing to tempfile");
fclose($handle);
// do something here
unlink($tmpfname);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<simpara>
If PHP cannot create a file in the specified <parameter>directory</parameter>
parameter, it falls back on the system default. On NTFS this also happens
if the specified <parameter>directory</parameter> contains more than 65534 files.
</simpara>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>tmpfile</function></member>
<member><function>sys_get_temp_dir</function></member>
<member><function>unlink</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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